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How to input the APN settings for mobile phone...?

Windows Phone:

Tap Settings.

Select Cellular.
Select Add Internet APN.
Enter the information for each field for the carrier you are using from the list of settings below.

iPhone/iPoad:
Open Settings.
Select General.
Select Cellular.
Select Cellular Data Network.
Turn ON Mobile Data if it is off.
Select APN.
Enter the information for each field for the carrier you are using from the list of settings below.
Hit the Home button.

Android:
Open the Settings
Select Wireless & networks
Select Mobile Networks
Select Access Point Names.
Tap the three dots at the bottom right and select New APN.
Enter the information for each field for the carrier you are using from the list of settings below.
When you’ve entered everything, tap the three dots in the bottom right corner and select Save.
Now tap the empty dot to the right of the new APN to select it